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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	[Reproductive strategy of Honey Buzzards Pernis apivorus in the northern Netherlands] (2000)
Auteurs :	Willem van Manen, Auteur
Type de document :	Article
Dans :	Limosa (73(3) 2000)
Article en page(s) :	81-86
Résumé :	Reproduction of Honey Buzzards was studied in a 6000 ha woodland area in the province of Drenthe in 1992-98. Breeding and non-breeding pairs were differentiated by means of behavioural clues. In the second part of the nestling stage Honey Buzzards with young in the nest made on average one flight above tree level between nest and foraging sites per two hours (mean length of flights 2342 m). Non-breeders made mainly undirected flights when seen above the canopy. By combining nest searches with checks from tree tops 2-3 km apart throughout the study area, the yearly proportion of breeders in the population was estimated at 47%. In 12 territories of non-breeding pairs a nest was built in July, clearly too late to start laying. In eight out of ten such territories, the nest contained a clutch the following year, suggesting that many non-breeding pairs build a nest in the year prior to egg-laying. Once pairs started breeding this was continued for 1-gtoreq8 years, on average four years in the same territory. Moulted feathers and sightings of individually recognizable birds indicated that mostly the same partners were involved over the years. In 41% of the territorial pairs eggs hatched and 34% succeeded in fledging on average 1.63 young. Overall breeding success was 0.55 young per territorial pair. Yearly breeding performance varied twofold in the number of pairs starting a clutch, threefold in pairs that produced fledglings and fourfold in number of fledglings per pair. The number of fledglings per pair seemed related to the diameter of wasp combs found at nests (R2=0.647, N=7, P=0.1), but the proportion of pairs laying eggs was not. Thus, Honey Buzzards seem unable to predict food availability at the start of the breeding season. Based on Swedish survival data (Tjernberg and Ryttman 1994) and the observed breeding output, and assuming a stable and closed population, the age at first breeding tor Honey Buzzards in Drenthe is estimated at 7.7 years. If breeding in later life is intermittent or net emigration of young occurs, breeding may start 1-3 years earlier. In Honey Buzzards the breeding window is narrow (late May - late August) and both partners participate in incubation and feeding nestlings. Successful breeding may require close cooperation between the sexes, only to be achieved after several years of fine-tuning behavior.

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